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backlight: Revamp error handling code to not leak the directory

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To neatly free the directory pointer allocated by opendir(), adjust the error
handling paths to go through to the err label.
This commit is contained in:
Rob Bradford 2012-12-05 18:47:09 +00:00 • committed by Kristian Høgsberg
parent acfb712127
commit 546c856ade
1 changed files with 9 additions and 8 deletions
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17
src/libbacklight.c
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@ -149,11 +149,11 @@ struct backlight *backlight_init(struct udev_device *drm_device,
char *pci_name = NULL;
char *chosen_path = NULL;
char *path = NULL;
DIR *backlights;
DIR *backlights = NULL;
struct dirent *entry;
enum backlight_type type = 0;
char buffer[100];
struct backlight *backlight;
struct backlight *backlight = NULL;
int ret;
if (!drm_device)
@ -208,10 +208,10 @@ struct backlight *backlight_init(struct udev_device *drm_device,
if (asprintf(&backlight_path, "%s/%s", "/sys/class/backlight",
entry->d_name) < 0)
return NULL;
goto err;
if (asprintf(&path, "%s/%s", backlight_path, "type") < 0)
return NULL;
goto err;
fd = open(path, O_RDONLY);
@ -246,7 +246,7 @@ struct backlight *backlight_init(struct udev_device *drm_device,
free (path);
if (asprintf(&path, "%s/%s", backlight_path, "device") < 0)
return NULL;
goto err;
ret = readlink(path, buffer, sizeof(buffer) - 1);
@ -280,7 +280,7 @@ struct backlight *backlight_init(struct udev_device *drm_device,
}
if (!chosen_path)
return NULL;
goto err;
backlight = malloc(sizeof(struct backlight));
@ -298,10 +298,11 @@ struct backlight *backlight_init(struct udev_device *drm_device,
if (backlight->brightness < 0)
goto err;
closedir(backlights);
return backlight;
err:
if (chosen_path)
free(chosen_path);
closedir(backlights);
free (chosen_path);
free (backlight);
return NULL;
}